Thats a great idea!
If you needed to keep change with you, you could take the velcro off of the cash pouch on the front. Then repeat the steps for the cash pouch, but on the back. Once you have the pouch on the back put the velcro back on the front.
Most of the time I pay with a card, so I never am carrying change with me. Hope this helps!
Cool! That is a really great idea! Thanks!